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Axt, Vollrath Martin ; Victor, K. ; Kuhn, Tilmann:
The Exciton–Exciton Continuum and Its Contribution to Four-Wave Mixing Signals.
In: Physica Status Solidi B.
Bd. 206
(1998)
Heft 1
.
- S. 189-196.
ISSN 1521-3951
DOI: https://doi.org/10.1002/(SICI)1521-3951(199803)206:1<189::AID-PSSB189>3.0.CO;2-5
Abstract
The combined influence of biexcitons and the two-exciton scattering continuum is analyzed. The analysis is based on a density matrix description of a two-band semiconductor accounting for mean-field contributions, bound biexcitons and the correlated parts of the two-exciton scattering continuum on a common footing. Consistent with the microscopic formulation, the influence of biexcitons as well as that of the two-exciton continuum is represented by a correlation kernel which is obtained from an integral equation. For a one-dimensional model four-wave mixing signals are calculated solving numerically the resulting coupled nonlinear equations for excitation conditions in the vicinity of the 1s resonance. A strong compensation between the exciton–exciton continuum and the mean-field contribution is found for all excitation conditions studied. Surprisingly, biexcitonic signatures turn out to be enhanced when continua are included in the description.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | excitons; dynamics controlled truncation; Semiconductors; laser excitation; ultrafast dynamics; non-linear optics; biexcitons; four-wave mixing; exciton-exciton continuum |
| Institutionen der Universität: | Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt Fakultäten Fakultäten > Fakultät für Mathematik, Physik und Informatik Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Eingestellt am: | 17 Okt 2017 08:22 |
| Letzte Änderung: | 07 Mär 2022 14:11 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/40025 |